Exhaust arrangement



1963 J. SCHLEIFER 3,071,059

EXHAUST ARRANGEMENT Filed Sept. 17, 1959 2 Sheets-Sheet l I INVENTOI? 2 J if /deLfr v 7 Jan. 1, 1963 J. SCHLEIFER 3,07

EXHAUST ARRANGEMENT Filed Sept. 17, 1959 2 Sheets-Sheet 2 FIG. 3

i T4, illtiitfi; eras Part r EXHAUST ARRANGEMENT Joset" Schleifer, Krumhach, Swahia, Germany, assignor to Eugen Bauer G.nt.b.H, Stuttgart-Unterturkheim, Germmy Filed Sept. 17, 1959, Ser. No. 840,581 Claims priority, application Germany Sept. 2%, H53 Claims. (Cl. 98-415) The present invention relates to an exhaust arrangement, and more particularly an exhaust arrangement for the housing of a motion picture projector.

Generally, there are several projectors provided in the projection rooms of a motion picture theater, and each projector is provided with an outlet tube for the hot gases produced by the arc lamp in the projector housing. A common discharge pipe is connected to all outlet tubes of the projectors, and it is known to provide an exhauster in the common discharge tube to improve the draft. However, the arrangements of the prior art require special discharge pipes, and are difficult to provide in existent projection arrangements. Moreover, an exhauster built into a common discharge pipe is not easily accessible, and consequently diflicult to service. An exhauster in the common discharge pipe will produce different drafts in the outlet tubes of different projectors, and if a common exhauster breaks down, all projectors become inoperable.

It is one object of the present invention to improve known exhauster arrangements for housing containing a heat producing source of light, and to provide an exhauster arrangement which reliably operates, can be easily built into existent installations, and can be easily serviced and exchanged, if required.

Another object of the present invention is to provide an independent exhauster for each projector housing of a group of projectors which discharge hot gases into a commc-n discharge pipe.

Another object of the present invention is to provide an exhauster arrangement which can be attached to the socket of a projector housing which is normally used for attaching the outlet and discharge pipes.

With these objects in view, the present invention mainly consists in an exhaust arrangement which comprises, in combination, a housing for a heat-producing source of light, such as an arc lamp; an outlet tube for hot gases secured to the housing; and exhauster means supported on the outlet tube and projecting into the same to move gases out of the housing and through the outlet tube.

In a preferred embodiment of the present invention the exhauster means includes a rotary impeller wheel located in the outlet tube, and a motor located outside the outlet tube. Wall means are provided in the outlet tube so that a separate passage is formed therein in which the impeller wheel is located. This passage is preferably connected to a suction pipe which extends into the region of the are lamp. The axis of the impeller is preferably downwardly inclined with respect to the upright outlet tube.

The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings, in which:

FIG. 1 is a longitudinal sectional view through a projector housing;

FIG. 2 is a sectional view on an enlarged scale illustrating the exhaust arrangement according to the present invention provided on the projector housing shown in FIG. 1; and

H Z atented Jan. 1, 1953 FIG. 3 is a fragmentary plan view of the exhaust arrangement shown in FIG. 1.

Referring now to the drawing and more particularly to FIG. 1, the housing 1 of a projection lamp is provided with an annular socket 10 to which an upright discharge pipe 11 is fitted. Electrodes 2 and f: are located in the housing 1, and an are 4 is produced between the electrodes in a known manner. The ends of the electrodes 2 and 3 are supported by brackets S and 6 which are connected to a support 7 carrying the reflector 8. Reflector 8 is concave and has at its center an opening 9 through which electrode 2 and its bracket 5 pass. This construction is known, and not an object of the present invention. in accordance with the present invention, an adapter outlet tube 12 is fitted on the annular socket 10, and the discharge pipe 11 is fitted to a corresponding end portion 13 of the adapter outlet tube 12.. It will be noted that the shape and diameter of the socket portions 19 and 13 are the same, so that the adapter outlet pipe 12 can be used in existent arrangements.

Outlet tube 12 is provided with a partitioning wall means 14 which forms two ducts 15 and 24 in outlet tube 12. The part of outlet tube 12 which is associated with duct or passage 15 has a lateral opening in closed by a supporting plate 17. An electric motor 18 is mounted on support plate 17, and has a shaft 19 projecting into duct 15 and supporting an impeller wheel 20. The diameter of impeller wheel 20 corresponds substantially to the transverse extension of duct 15. The axis of motor 18 and impeller wheel 2'13 is inclined to the upright direction of the outlet tube 17..

Partitioning wall means 14 has an opening into which an arcuate upper end portion 23 of a suction pipe or tube 21 is fitted. The lower end of suction pipe 21 is provided with a flaring end portion 22 with an opening which is located directly above the electrodes 2 and 3, and more particularly above the are 4 shown in FIG. 1. The arcuate end portion 23 is curved to extend in the direction of the axis of the impeller 20, and to open directly opposite the same. in this manner, the hot gases produced by the are 4 will be directly drawn through suction pipe 21 into passage 15 and discharge through the open upper end of passage 15 into the discharge tube 11. The other passage formed by partitioning wall means 14 communicates directly with the remaining portion of the: lamp housing 1.

Support plate 17 has an arcuate wall 25 projecting therefrom and partly surrounding motor 18. Space 26 between motor 18 and wall 25 communicates through apertures 27 with duct 15 so that the impeller wheel 20 produces a draft in space 26 by which motor 18 is cooled.

When the projector is operated, and an are 4 is ignited, the interior of the housing 1 will be cooled by the natural draft developing through duct 24. When motor 18 is started, impeller wheel 2% will produce strong suction in the suction pipe 21 and will draw the hot gases of the are into duct 15 and expel the same into the discharge tube 11. The stream of gases passing through the upper end of duct 15 into tube 11 will produce a suction effect at the upper end of the second duct 24, so that the draft in duct 24 is considerably improved, and hot air is removed from the remaining part of the lamp housing 1.

The inclination of the exhauster means 18, 26 with respect to the vertical direction of the adapter tube 12 and discharge tube 11, permits a particularly advantageous construction of the suction pipe 21 and of the outlet duct 15. Due to this arrangement, it is not necessary to deflect the stream of gases through 99, so that energy losses are reduced to a minimum. The slide curvature of the partitioning wall 14 at the upper end of the duct 15- will produce almost no losses due to turbulence.

In the event that the natural draft in duct 24 is insuii'icient, even though improved by the ejector action of the stream of gas passing out of duct 15 into outlet pipe 11, a closure plate 28 can be placed at the upper end of outlet duct 24. An opening 29 is provided in the arcuate portion 23 of the suction pipe 21, and can be gradually closed by a valve plate 3% pivotally mounted on the housing on a pivot means 31. When opening 29 is at least partly opened, impeller wheel Zll will suck hot air and gases through opening 29 into duct id for discharge into discharge pipe ll. Also, by placing closure plate 28 in different positions, the open cross section of duct 24, can be modified in accordance with prevailing conditions. in this manner, the exhauster arrangement can' be adapted to operational conditions, and to the prevailing temperature.

It is evident that the exhaust arrangement of the present invention can be used for any housing in which a heatproducing source of light is provided. A conventional arc has been illustrated, but the arrangement of the present invention can be advantageously used for all sources of lights which have to be cooled by a stream of air, or which develop gases which have to be discharged, particularly gas-filled arc lamps.

it will be understood that each of the elements described above, or two or more together, may also find a useful application in other types of exhaust arrange ments differing from the types described above.

While the invention has been illustrated and described as embodied in an exhaust arrangement for the housing of a projection lamp, it is not intended to be limited to the details shown, since various modifications and structural changes may be made without departing in any way from the spirit of the present invention.

Without further analysis, the foregoing will so fully reveal the gist of the present invention that others can by applying current knowledge readily adapt it for various applications without omitting features that, from the standpoint of prior art, fairly constitute essential characteristics of the generic or specific aspects of this invention and, therefore, such adaptations should and are intended to be comprehended within the meaning and range of equivalence of the following claims.

What is claimed as new and desired to be secured by Letters Patent is:

1. An exhaust arrangement comprising, in combination, a housing adapted to cover a heat producing element; an upright outlet tube for hot gases secured to the top portion of said housing and communicating with the interior of the same; exhauster means supported on said outlet tube and including a motor located outside of said outlet tube, and an impeller wheel located within said outlet tube; wall means in said outlet tube extending across the same and forming in said outlet tube two upright passages, one of said passages having located therein said impeller wheel and the other of said passages leading directly to the upper portion of said housing; and duct means in said housing extending downwardly from said one of said passages and having a lower end forming an inlet opening adapted to be located in the region of said heat-producing element so that the impeller wheel moves gases from said heat-producing element through said duct and out of said outlet tube.

2. An exhaust arrangement comprising, in combination, a housing adapted to cover a heat producing element; an upright outlet tube for hot gases secured to the top portion of said housing; exhauster means supported on said outlet tube and including a motor located outside of said outlet tube, and an impeller wheel located within said outlet tube; wall means in said outlet tube extending across the same and forming in said outlet two upright passages, one of said passages having located therein said impeller wheel and the other of said passages leading directly to the upper portion of said housing, said Wall means having an opening located opposite said impeller wheel; and a suction tube having an upper tube portion extending in said outlet tube to said opening and a lower tube portion extending in said housing and having a lower end with an inlet opening adapted to be located in the region of said heat producing element so that said impeller wheel moves gases from said heat producing element through said tube and said one of said passages and out of said outlet tube.

3. An exhaust arrangement comprising, in combination, a housing adapted to cover a heat producing element; an upright outlet tube for hot gases secured to the top portion of said housing and communicating with the interior of the same; exhaustcr means including a motor, an impeller Wheel, and shaft means connecting said motor with said impeller wheel, mounting means for mounting said exhauster means on said outlet tube in a position in which said motor is located outside of said outlet tube, said impeller wheel is located within said outlet tube, and said shaft means extends through the wall of said outlet tube inclined to vertical and horizontal planes so that st im eller means is located lower than said motor; wall means in said outlet tube extending across the same forming in said outlet tube two upright passages, one of said passages having located therein said impeller wheel and the other of said passages leading directly to the upper portion of said housing, said wall means having a lower portion extending perpendicular to said shaft means and having an opening located opposite said impeller wheel;

and a suction tube having an arcuate upper tube portion extending in said outlet tube to said opening and a lower tube portion extending insaid housing and having a lower end with an inlet opening adapted to be located in the region of said heat producing element so that said impeller wheel moves gases from said heat producing element through said tube and said one of said passages and out of said outlet tube.

4. An exhaust arrangement comprising, in combination, a housing adapted to cover a heat producing element and having on top an annular socket adapted to be fitted to an upright discharge tube; an upright adapter outlet tube for hot gases fitted to said socket and secured to the same, said adapter outlet tube having an upper end adapted to be fitted into the discharge tube so that the interior of said housing communicates through said adapter outlet tube with the discharge tube; exhauster means supported on said outlet tube and including a motor located outside of said outlet tube, and an impeller wheel located within said outlet tube; wall means in said outlet tube extending across the same and forming in said outlet tube two upright passages, one of said passages having located therein said impeller wheel and the other of said passages leading directly to the upper portion of said housing; and duct means in said housing extending downwardly from said one of said passages and having a lower end forming an inlet opening adapted to be located in the region of said heat-producing element so that said impeller wheel moves gases from said heat-producing element through said duct means and said one of said passages and out of said outlet tube.

5. An exhaust arrangement comprising, in combination, a housing adapted to cover a heat producing element; an upright outlet tube for hot gases secured to the top portion of said housing and communicating with the interior of the same; exhauster means supported on said outlet tube and including a motor located outside of said outlet tube, and an impeller wheel located within said outlet tube; a curved wall means projecting outwardly from said outlet tube and at least partly surrounding said motor and defining with the same an air space, said outlet tube being formed with aperture means opening into said air space so that said impeller wheel draws air from said air space through said aperture means into said outlet tube to cool said motor; Wall means in said outlet tube extending across the same and forming in said outlet tube two upright passages, one of said passages having located therein said impeller wheel and the other of said passages leading directly to the upper portion of said housing; and duct means in said housing extending downwardly from 5 said one of said passages and having a lower end forming an inlet opening adapted to be located in the region of said heat-producing element so that said impeller wheel moves gases from said heat-producing element through said duct means and said one of said passages and out 5 of said outlet tube.

1,318,701 Sperry Oct. 14, 1919 1 6 Wheller Sept. 20, 1921 Allen Nov. 5, 1935 Gretener Dec. 22, 1953 Heller Jan. 28, 1958 McLarly May 16, 196-1 FOREIGN PATENTS France June 19, 1933 Switzerland Feb. 15, 1951 

1. AN EXHAUST ARRANGEMENT COMPRISING, IN COMBINATION, A HOUSING ADAPTED TO COVER A HEAT PRODUCING ELEMENT; AN UPRIGHT OUTLET TUBE FOR HOT GASES SECURED TO THE TOP PORTION OF SAID HOUSING AND COMMUNICATING WITH THE INTERIOR OF THE SAME; EXHAUSTER MEANS SUPPORTED ON SAID OUTLET TUBE AND INCLUDING A MOTOR LOCATED OUTSIDE OF SAID OUTLET TUBE, AND AN IMPELLER WHEEL LOCATED WITHIN SAID OUTLET TUBE; WALL MEANS IN SAID OUTLET TUBE EXTENDING ACROSS THE SAME AND FORMING IN SAID OUTLET TUBE TWO UPRIGHT PASSAGES, ONE OF SAID PASSAGES HAVING LOCATED THEREIN SAID IMPELLER WHEEL AND THE OTHER OF SAID PASSAGES LEADING DIRECTLY TO THE UPPER PORTION OF SAID HOUSING; AND DUCT MEANS IN SAID HOUSING EXTENDING DOWNWARDLY FROM SAID ONE OF SAID PASSAGES AND HAVING A LOWER END FORMING AN INLET OPENING 